Composite pole for electric wires and other purposes.



PATBNTED DEC. 25, 1906.

B. m, JOHNSON. I GOJMPOSITBPOLB FOR ELECTRIC WIRES AND OTHER PURPOSES.

APPLIOLTIOII FILED 10V. 15, 1805.

Juluullo 44 (In k 11 d fi wdu UNITED sTATE I PATENT, OFFICE."-

EUGENE MALCOLM JOHNSON, OF ALLSTON, MASSACHUSE'ITS.

' COMPOSITE POLETORELECTRIC WIR'ESAN'D OTHER Punro srs.

To all whom it may concern..-

Be it known that I EUGENE MALCOLM JoHNsoN, a citizen of the United States re sid' at Allston, in the county of Suffolk and tate of Massachusetts, have invented certain new and useful-1m rovements in Composite Poles for Electric ires and other Purposes, of which the following is a specification, reference being had therein to the accompanying drawings.

The object, of my invention is to produce a durable composite pole for telegra h, tele;

, framework of 3 3, 4 4, and 5 5 ofFig. 1.

phone, electric-light wires, and ot er purposes-for use as-a substitute for metal poles and-for wood poles now commonly in use.

Figure 1 is a, perspective view, partly in section, of an erected pole contaming my invention. Fig. 2 is a vertical cross-section at a line corresponding to line 2 2 of Fig. 1.

Figsillt', 4, and 5am horizontal cross-sections at es corresponding, respectively, to lines Inv he drawings, 1 is a hollow sheet-metal Eprforat'ed plates fastened together at 2, w 'ch shows the edges of the lates' bent an larly and lapped together to cm lengthwise-extending and outwardlyprojecting ribs of the metal frame. These ribs constitute lengthwise-extending reinforces for the outer plastic covering and 1 also facilitate the driving of the composite .R oles, hese iles, or'structures into the earth. lengthwiseextending metallic ribs, preferably extend 'to the lower end of the structure, which is lpreferably pointed. Q The plates also prefera ly have lateral integral projections 3 and are thick and strong beyond the sides :to such anextent as tg be used for treads. The object'of the tubular plugs 5 is to receive a portable tread-forming 1 pin which the'wire or lamp inspector may carry and insert inthe op'eii ends of the plugs so as tocli'nib to treads 4, the lowest of which are desirably far enough above the ground to,

prevent easy access to the treads by persons not having right thereon.

Specification of Letters Patent.

A li ti n'fllad November 15,1906. Serial No. 287.546-

Patented Dec. 25, 1906.

' At the upper art of the pole frame 1 has its opposite si es perforated for assage therethrough of a projecting crosseam 6 for supporting wires, lamps, &c., The outer ends 0 braces 7, .the lower end of each of which is fast at 8 to a side wallofframe 1. The upper ends of the braces are fast to the cross-beam at 9. 1 Thus a comparatively light-weight the cross-beam are connected with sheet-metal frame is readily produced which yet has strength andrigidity enough to support anysuitable number of cross-beams and their load. 1

To secure the .metal framework 1 from oxidation and also to make it strong enou h to withstand the strains of winds and all oads to which it may be sub'ected, the framework is exteriorly coated wit cement, concrete, or other suitable lastic composition, which passesthrough t e holes 10 and is anchored on and around the projectiops 3. The chamber of the pole is best completely filled with concrete, tamped in place to ehminate airchambers contiguous-tothe metal, whereby oxidation woul result. Bythis construction the interior and exterior composition is united'throu h the perforations and a stron and solid 0 e capable of sustaining latera strains an vertical loads obtained.

The hollow frame 1 is shown of rectangular cross-sectional form, but may be of any desired cross-sectional form. or' area.' The inner plastic filling and outer plastic covering unite throu h the holes and are anchored on and about t eprojections. The filling gives additional support to cross-beam, treads, and tread-receiving plugs and keeps the frame from becoming bent.

Preferably the projections extend on the outer sides of the frame.

They not-only sup- 1prortthe plastic covering-, but tend to keep it om cracking.

' The pole, referred to may be as a pile and be made of any desired cross-sectional shape. For such uses it is desirable to fill up the lengthwise chamber of the metal part of the pole with concrete or the like. The piles may be erected in situ or previously constructedv and driven after the rial has solidified. What I claim is-- '1. A structure comprising a hollow, sheetmetal frame the walls of which are perforated and provided'with lateral, integral projections combined with an interior filling; an outer covering of plastic material anchored plastic mateto the frame through said holes and about said projections; said frame having lengthwife-extending, projecting ribs on its outer si e.

2. A structure comprising a hollow, sheetmetal'frame the walls of which are perforated and combined with an interior coating; an outer covering of plastic material anchored to the frame through said holes; the frame having lengthwise-extending and outwardlyprojecting ribs.

3. A hollow, sheet-metal structure the walls whereof are perforated, in combination with a cross-beam mounted in holes through said structure and projecting therefrom; said structure having lengthwise-extending and outwardlyrojecting ribs.

4. A hoilow sheet-metal structure, the walls whereof are erforated and formed with lateral, integra projections; in combination with a cross-beam mounted in holes through said structure and projecting therefrom and braces from the outer ends of the cross-bar to the frame said structure having lengthwise extending and outwardly prol jecting ribs. 5

5. A hollow sheet-metal structure, the I walls whereof are erforated and formed i with lateral, integra projections; in combination with a cross-beam mounted inholes through said structure and projecting therefrom, and a fillin of lastic material said structure having engt wise-extending and outwardlyrojecting ribs.

6. A hollow sheet-metal structure, the walls whereof are erforated and formed with lateral, integra projections; in combination with a cross-beam mounted in holes through said structure and projecting therefrom; a filling of lastic'material, and an outer covering of p astic material said struc ture having lengthwise-extending and outwardly-projecting ribs.

7. The combination of a hollow sheetm'etal frame; and treads mounted in holes through the frame and projecting therefrom said frame having lengthwise-extending and outwardly-projecting ribs.

8. The combination of a hollow sheetmetal'frame and chambered tread, pin-receiving plugs mounted in holes therethrough, said frame having lengthwise-extendingand outwardly-projecting ribs.

In testimony whereof I affix my-signature in presence of two witnesses.

EUGENE MALCOLM JOHNSON.

E. A. ALLEN. 

